Mounting The External Anti-Rotation Fixture - Samson 3281 Mounting And Operating Instructions

Installation
5.3.1 Mounting the external
anti-rotation fixture
Before mounting the actuator, the external
anti-rotation fixture must be mounted onto
the plug stem in some cases. The valve must
be closed beforehand.
For SAMSON Type 3271 and Type 3277
Actuators with Type 3273 Hand-operated
Actuator, observe the mounting and operat-
ing instructions of the hand-operated actua-
tor (handwheel) to mount the anti-rotation
fixture u EB 8312-X.
a) Standard version for
Series 280 Valves, DN 125
and larger
See Fig. 5-2 and Fig. 5-3
1. Insert ball bearings (310) into the recess-
es in the bonnet.
2. Place the yoke (3) on the bonnet in such
a way that the ball bearings fit into the
recesses of the yoke.
3. Fasten the yoke (3) using the castellated
nut (92).
4. Fasten the hanger (83) and warning la-
bel (255), if applicable, to the yoke us-
ing the screws (82).
5. Position the travel indicator scale (84) on
the hanger (83) with the screws (85) ac-
cording to Table 5-3.
6. Use a soft-faced hammer or lever press
to press the sliding washers (309) with
their beveled part first (without using any
lubricant) into the recesses of the clamps
5-4
(301) as far as they will go. Remove any
excess material.
7. Apply a thin film of lubricant (114) to the
threads of the stem (9) and screws (303).
NOTICE
!
Impaired functioning due to incorrectly
applied lubricant.
Î Do not apply any lubricant to the threads
of the clamps (301) or the plug stem.
8. Position the clamps (301) and stem (9)
on the plug stem according to Table 5-3
and tighten screws (303) and washers
(304) by hand.
9. Mount the actuator. See section 5.3.2.
10. Thread the stem (9) upwards until the
head of the stem rests on the extended
actuator stem.
11. Retract the actuator stem to relieve the
stem (9).
12. Gradually tighten the screws (303) in a
crisscross pattern. Observe the tightening
torques specified in Table 5-1.
Table 5-1: Tightening torques
Screw size
M12
M16
13. Check and ensure the following:
− There is a nominal clearance of 0.5
to 1 mm between the sliding washers
and their contact surface on the yoke
Tightening torque
[Nm]
50
121
EB 8251 EN